well i just put in a material order!!!! this is what i got
120' of 1x1 16 gauge
80' of .75x.75 16 gauge
~100' of 1.375 DOM tubing with .120 wall thickness
24x24 11 gauge plate for mounting points
48*48 16 gauge plate for passenger area.
later I'll most likely get some aluminum and cover the whole bottom.
as far as
Grintch wrote:
nkw8181 wrote:
Ok so this is the results I have using 1.375x.095 round tube for the cage and .75x.75x.125 for the rest of the frame. This time I constrained the frame at the shock mounting points as suggested by blackbird. The results are closer to what I want and my whole frame only weighs 177 lbs. I applied an equal an opposite force on the front and then the rear. The result for the front is 3168 ft*lbs/deg and the rear is lower at 2066 ft*lbs/deg so I may add a tube or change a few to larger tubes at the rear.
? anyone ever used .75 square tubing for the whole frame plus cage?
Personally, I would never even consider 3/4 x 3/4 x 0.125 tube. To improve stiffness, increasing the diameter is MUCH more effective than increasing the wall thickness.
3/4 x 3/4 x 0.125 tube is approximately 30% heavier than 1x1x0.065 (the locost standard 16g tube), AND its only 60% as stiff.
Going the other direction 1 1/4" square 18g gauge tube (0.049) is 60% stiffer and slightly lighter than 1x1x0.065.
I di the calc with .75x.75 16 gauge and got decent results. i went with what i did because this setup is only ~200 lb without plating. plus my analysis was not including any flat plates so it will end up stiffer
thanx for the help guys. i'll be updating my build long one i actually get some build done next week!!!